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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 8,250 | $ 9,183 | $ 10,298
Charged to cost and expenses | 672 | 184 | (245)
Write-offs (recoveries) of doubtful accounts | 309 | 1,117 | 870
Balance at end of period | 8,613 | 8,250 | 9,183
Student Loan [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 21,026 | 15,682 | 8,622
Charged to cost and expenses | 17,858 | 15,917 | 19,019
Write-offs (recoveries) of doubtful accounts | 19,523 | 10,573 | 11,959
Balance at end of period | $ 19,361 | $ 21,026 | $ 15,682

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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